Agilent Technologies 86121A, User Manual, Page: 186 / 240

Test 4. Optical Input Return Loss 6
-
9
Compare this measurement with the specification listed
in
Chapter 7, “Specifications and Regulatory
Information” .
Procedure Option 022 instruments (angled contacting con-
nectors)
1 Turn off the output of the source module.
2 Connect a single-mode patchcord between the optical
output of the source module and the
INPUT SOURCE
connector of the return loss module .
3 Set the wavelength on the return loss module to
1550 nm, and select an average time of 1 second.
4 Locate an HMS-10/HP/HRL to FC/APC (angled FC)
patchcord. Connect the HMS-10/HP/HRL end of the
patchcord to the
OUTPUT connector of the return loss
module. Terminate the FC/APC end of the cable.
5 Zero the return loss module.
6 Turn on the source module.
7 Remove the termination from the cable, and connect the
FC/APC end of an FC/APC to FC/PC cable to the free
end of this cable. Leave the free end of the cable
uncovered.
8 The return loss module measures the reflection
reference (14.6 dB return loss of the FC/PC connector of
the patchcord in air).
9 Disconnect the FC/APC to FC/PC cable.
10 Make a low-reflection termination in the HMS-10/HP/
HRL to FC/APC patchcord. Do this by wrapping the
cable around a 5 mm diameter mandrel six times.
11 The return loss module measures the termination
parameter.
12 Connect the HMS-10/HP/HRL to FC/APC patchcord to
the front-panel
OPTICAL INPUT connector of the
Agilent 86121A.
13 The lightwave multimeter measures the return loss.
Compare this measurement with the specification listed
in
Chapter 7, “Specifications and Regulatory
Information” .